10 Best Engine Leak Sealer 2025 in the United States

The ATP Automotive AT-205 Re-Seal is a professional strength leak sealer designed to stop leaks quickly. It stands out for its multi-application compatibility, working with engines, transmissions, power steering, differentials, and hydraulic systems. The product is suitable for both conventional and synthetic oils, ATF, gear oil, power steering fluids, and hydraulic oil, making it very versatile.

One significant advantage is that it does not contain petroleum distillates, ensuring that it will not over-swell or break down seals, which can be a common issue with other products. The 8-ounce bottle treats up to a 6-quart capacity, which should fit most typical automotive needs with adjustments as necessary.

The compact size and ease of application make it a convenient choice for most users looking to address leaks in rubber seals and gaskets effectively. This product would be particularly beneficial for users needing a quick, versatile, and non-damaging solution for various automotive and hydraulic systems.

Bar's Leaks OS-1 Seal Engine Oil Burning/Leak Repair is a versatile product designed to fix oil leaks and reduce oil burning in various engines. It's compatible with a wide range of gasoline and diesel engines, including turbocharged and hybrid models, which makes it suitable for many users. This product is particularly useful for vehicles that don't consume more than a quart of oil per day and can address issues with worn valve seals and guides, making it a good option for older engines.

Additionally, it helps eliminate blue exhaust smoke and can be used in cars, trucks, vans, SUVs, and even heavy-duty vehicles like tractors and boats. The universal fit ensures it can be applied to many types of engines, which is a significant advantage. The ease of application is another plus, as it doesn't require any special tools or extensive mechanical knowledge.

However, it might not be effective for severe leaks or engines consuming more than a quart of oil daily. Also, while it works quickly, results can vary depending on the extent of the engine wear and the type of leak. Bar's Leaks OS-1 is a reliable choice for addressing common engine oil leaks and reducing oil consumption in a broad range of applications.